Abstract
Using per(3,6-anhydro)cyclodextrin derivatives [per(3,6-anhydro)CD], it was possible to produce new lanthanide chelates by careful choice of the size and functional groups. Heptakis(3,6-anhydro-2- O-methyl)cyclomaltoheptaose fulfils the best criteria for complexation of lanthanide ions. Nuclear magnetic resonance was used to derive the association constants and the stoichiometries of these new complexes. Finally, a three-dimensional structure of these complexes consistent with the NMR data is proposed, to ascertain the position of lanthanide in the cavity of the per(3,6-anhydro)CD. For the present purposes, heptakis(2- O-acetyl-3,6-anhydro)cyclomaltoheptaose, octakis(2- O-acetyl-3,6-anhydro)cyclomaltooctaose, heptakis(3,6-anhydro-2- O-methyl)cyclomaltoheptaose and octakis(3,6-anhydro-2- O-methyl)cyclomaltooctaose have been synthesized and purified.
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